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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99e50948f58d880dbf1dae58e920f33e1b79eed96bcfe7a4778f5a66beb9baa' 
  AND token = 'y1ETwdh51ZNrwXAHBHasqfE/hG1MY9Y+EkFvK+wVFTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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