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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ae58d83b31f35cbaca65f776b88e4bba2e349427351f4290ae9ba908514777' 
  AND token = '348g21uPMJb0rQqzVbF0yGPRYasDfdjPpl0LC2x87AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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