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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e350620eb0b40ce9e1e7df57d4da0e11680015a09ea6f03005d86b24d95ef2' 
  AND token = 'SNdiJvP1S18SaQQJPFmyUD7RDmAHMU4QygIoAFayPDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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