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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd787aef27c02d73505bdca16c927b33ddebcf14add7f482850876931119a75' 
  AND token = 'Zrvy7Emhslef/ecCP7zp0hV+r/dl/BZ8G/Mm7BhD544=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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