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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a854eef6a4c3be3739433306deab90ca1f1e720a5464a41566af2d9d9b62aac' 
  AND token = 'UqY9ZUpwUmacyL2QdhN/6jDx1dGGPu6LGb6ZJYZewx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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