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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4024247e4b60e6cacb3cae2ca9d1830b66249d30418667e2cf91c9c04c88e5' 
  AND token = 'aQS/egmfY1ZaCBLMEL/qtkfo2q0QwVvzCUfzruIo9Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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