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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739dccb19f5d9208a7c4e2967798bf9662dc3505e9831c6bd1f0248fe93e5955' 
  AND token = 'BHQ9Pz8L+K1LmMs/8kAe1WJuJs2L+8epEAGWuG4MVGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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