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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1754334e031954b11ea416f0d1b1492c8a59db90f8704d7925d26662e9b52a63' 
  AND token = '7vgCrcvnarRQ7KreDkeCWSXzXCW6dwXEPKBv8kmy4Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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