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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0abd954e493c58479dd5a5e33a9224e7debb081f104553af947bf263a415be2d' 
  AND token = 'uKhwJT+6jyd4aHjGom014aSdYIAg40+5kmxQl/8K/eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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