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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d54b24545640bf6dc439a0936f0829d4ce6afb86dd2814d800c6c6a58453f0' 
  AND token = 'vHA1pBHooX4eugyG4sSwb9d8e5mNvszlpeSR3XB9bRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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