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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f23b133fb8525a18c47850e4c12ad076d435eee1f494c56e9a9eb4eb48bf3e' 
  AND token = 'a21LRtyyTZbwkctoKlP6z54gGRkmWAHWyacrR5Y3wtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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