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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e866af2ac4ab9c08c12901913bdf866751e05e63de5d913ac8fbd3ae9bd5d3d3' 
  AND token = '2v90B8gSRZEN+yf/GEXkyEdsu6Of2BVuDUCt4ueEQ20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}