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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad76bb9833c7d66c5c320107b1e841cb2affeb980a76d6189c459dbfea0ac79' 
  AND token = 'L5HoeE8Ns4Kt8UvEFzEHUKJvS2u/EBBcrw2hrl/jio0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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