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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691c6d3a035fe032bba61ce4ce8ce7a576cf33d0203281f5e378888c40641f63' 
  AND token = 'JEzT4No2zIqA3Dz2w2uqUhpPPtnX+sddtAy1FlOFExM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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