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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e9d0e5700e8e7a080b7759cca245f34b66634b17efd1b5ce7e4ac13b8286be' 
  AND token = 'zoP52E4Upi8DIdItHazUwdSQ8EHU8Z2Ww1GtQvVrCeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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