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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e461c712e5da346e431e311b57d516c8ed66b0142abf17d9e580e80b52d3c8' 
  AND token = '3K66Jeq2eY1ZpL2RN71hLG5tDSTK6eH8Gtjc1+Gr1HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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