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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db29a8dd1e743529529a0ca6e85c661e1a9be1bd25898d3e76ce03b0c392b71a' 
  AND token = '3s1xor+NrkoJnPqj61FdzB++TcGaQDf5s5grB2+5TBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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