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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e61bb92e8646402d0d1a97bff6b7f775c05b7762da3574489e88ab97647c27d' 
  AND token = 'w3kosyx6ZrV8aXhvHdZsUtysFTPX7gjR5aPSejsyJ5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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