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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a7e16bde4d06774ac2b6fffa3cad6f45f0b00c5b0674f8a648ae07356d47a3' 
  AND token = 'B5QmrsYWp9TMjttVByO2zWUBdcqR/zvr9ReEXQ84JnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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