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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04eeacdde652205e1dae4c70efede8663c93e6c1b57eb32ab389a3bdb9c95d18' 
  AND token = 'v1epLH0lvESM8DtI+wYZ0dqefVRXF2HZYc3tJd1XzEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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