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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076840f85000f06c0c167dadb802a8dff16983b3cb08245a5992689838eb22db' 
  AND token = 'eMNpU6B15d1GaJVQ8NVWDydI+keWgjyCO7hVt+O5BU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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