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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d45570d4a69f796aed7acf3c52e5a35d511ea7a685ae62f88c189fee7a4fd4' 
  AND token = 'kL42Jl3Fb6Nr6pt6oD9XBEEVhxCzQ43sb41GR4iSk94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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