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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fec15e6e29145a44c53e0d34e0c63aca1ffb9e3b8c724df97fd92e9a10e959b' 
  AND token = 'fBJclxqIGWJCG1puuuvFxnsL0de8C0Y4nsqNpAxfu00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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