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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f64f0c366acf0bc2cf7236f70f5a44bd100103165b63b7888763d740f12f77' 
  AND token = 'Lb/PG71AfKrDmrqlEe+2VcQZRjrcnvmsol8+ybS1q9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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