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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c010fd4a62bf8efbe947b8c5c8f4dbcc461a2072910256f497a55bfddf5019e4' 
  AND token = '2JX5w1Ms9CWMg0FLF4U/va01AUYFqhmEomgih7KoJCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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