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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08dd150179fc3558bcfd8ec9dc4ebb7a31f0c5a145324b10054f33bcfe0a3776' 
  AND token = '+rqXPshbRtenFVDQybpQjw/dl1qiV1lpyg3jy76KeMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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