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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e875e3ede1b8f3768b1de9881b54af3d5c8be7639e2d5554c2ed0feaed2a212f' 
  AND token = 'VqNv7HWYCte5Fb2pPrzQa3u884z+a3RayHHPkNmD3vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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