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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba82f19836f3a835715e33409c2f00e19c436bc1d51678a35c05fc9e7e9498ae' 
  AND token = 'F4dd4+OGen7LlIEQA2pOb8TLtzPIlLpf6AxKrk/z6wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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