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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b39891f9fc7caa520f6db0b6074fed633c00d5f74637a6db43a3aee18ecbac' 
  AND token = 'Hra8HW1SjEzHpMRv2rgJ2af1G2J61bjjJaxCzolb5oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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