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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd77ed2b9fc09a6d4698f97d9b7770049d69199b7fdbc65589ab1fede156368a' 
  AND token = '8NmDh3ggvibHCr/ZoG2PfRixK5F69DS+w0DBuBOtQH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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