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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcad59262a4efccef0d37fa93747a04b3e26cf5d1795a1ec57dcf542a43aabc3' 
  AND token = 'fIw7JE3t+1gEN8w7HP33l/mMoZZH0y4O4gSL54g1Zeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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