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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74867c3eb7f7099bf813d8bbbaf4075a8fb66be8dfb2d3aef0d5f4fd27035fe9' 
  AND token = 'ElzmrLsQStPTIFsGffkrkI9XW11gGH/8uEc00Pszvo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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