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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88634f357b12465ea71c069b368c8ddba2ae8479e10854412377a9c8c7aa10d' 
  AND token = 'lJ88ceTUL/vKSAQkAMgO3RA7kw8HACDc3KON4EaACdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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