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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f90fd3fd02c2699dd141d09392c3e305628622e3d0016e0691929392a56bc24' 
  AND token = 'RhFaODLhqMweK9JUdEFSQU2V0Ltvhu11Sc3e6nPLAyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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