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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de61062e9566c0265e308f5eebf52c18e96491bc0da315423ec114c264bab126' 
  AND token = 'Izj80KPAgI8Me4Szzni+RKyF6mcXTku5Jdl9LYRVASg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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