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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8dd9309aac8ea31c547ea81ca15c87fdbc8ec93f57be9441f734a8eb482bc0' 
  AND token = 'R7dZ5labu6+/IJcP3hJsPNtxKeNuIVIW7rbcjkcJc9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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