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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f55acdfa1d4298358a1a517546e1138c169b7653b8eceaabac380d9c47f3e9' 
  AND token = 'rRAJI9BqGnGVhwnrGcKoXTR90csvuA8Z9ZQR97LTer4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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