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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3903ca766f14d9701e18cdd0c3a0d1b6d1347579c30f182d3d48a16bb94e30' 
  AND token = 'kipFQu08/gwsOneD/GFjbdoSrzaNPQdEYdlZ9VukWV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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