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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6785d1b72317f0334ec401badc9194d57be66cb6221790fc2dd12a05fe5c73cf' 
  AND token = '8O/6I04F/pR2Tgduh0/mpQWoRRRfmCKF/IuYo0rl6Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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