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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a558b0cb4bafe55da65f6c6dc0d739188af9b99ba6bb9ca5c2b2b1ae15c83b' 
  AND token = 'vplDXPCY93BISM3DjCS7KFguazF4uJ5VA85SPrY1d1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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