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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7596da74290cfc3d32f5e0802faf4b8a489e3aaa462e65ef293ecafc32fb70c8' 
  AND token = 'I+qPMogy3m2JUCnpDyr+Iu3ep3aXUgGje9Zw76KeZeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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