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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c7d3da00034e8ab4cf2a16f494b31dc1cf6ee6d0c40b9f2acd8457d2d36273' 
  AND token = 'fMneZnbwsnbGLYdY5bMsIjy8d+L5njsrhAiC42r5m9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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