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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a5d25b7b07d522d58b7f9dabb931877f8996ff6df7f994708cf3da32e123af' 
  AND token = 'ZKwjjjlYGMLUyekzoIa6dW2yJ8edTCp+K8yS2l827dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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