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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8faef1f273b0450b63adcc9519e9820e70b1e6f20da2377515b0e3380875d2bb' 
  AND token = 'RDNTgK84i/atjftqpJ0/Kk0+N6xNcL9c2bIJtcnJvZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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