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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517ae676825ce8c5b503b2a2e7e6eed8f9f0c6c751bed2e9f76a12b49049a0bd' 
  AND token = 'bis7bt+Rsg6iRd3IEijI8+gaBHCYV8ZkVwkghEUER6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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