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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da46d373ce52b22b9fdb47fb6ef3ae559cc72fd5b67079e449931131b4ecfabd' 
  AND token = 'x/RRy07/8E9EUGPhveuOo/jrtltVQaMQLFBZjG8OnVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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