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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b2c2b3c9d739efae95d97e34d1c4faa0d2c225d6b1aef0486159431ea5d06b' 
  AND token = 'ajIjysIlklwMM7o+b3+0YVSmky7n3dYybRA6wMANAMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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