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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1158271b15e67b44b87e0ef97ada0d1cde042acf903d1edf86d3971035de5f55' 
  AND token = 'MwtWsPl24EMJf7lKL1YoJcoEwiD258ofmN4BecBcSw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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