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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09411457684ad38bb16bf091ff57d507da3f553d59862518e4d21c3a0ed13c63' 
  AND token = 'qiiAvkST6rvsBkqf5lbzceO/ISilvG8HFaAkYKiIXnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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