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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfe26e232e6eb99586ca09d6af321c38507de803ce71482092db685987d9b1c' 
  AND token = '2+jz0s7M3pj6qG5zuqNz/wT7qR1Ox6k/1faH/+HYISE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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