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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4fe11a341f53fdb47efb3c460a83df370047562c7608210d96269914a2262f' 
  AND token = 'ioB42EchAz3FeWuw2wLST0ZkvomJOYJEeBbigmp54b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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