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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76290dad4c29831bf221801f192d0308541ea1944c36c3675b130b981a1a768' 
  AND token = 'Ky4OGX4KpMTLOkdRdtNKSFu7Dodc5kTy3UpHnXv+05Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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