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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53a63404238b39b66fc130fd58cfe7c0368d745e1f0bde7a1e0eff46f2be93a2' 
  AND token = 'BF8fxg7oYfF+tnyt1jpc7pJg4plpwC7vjr9bKRImibo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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