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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7c313796769841dbde63cede8c42594040001afa2208a615b67230c34c0688' 
  AND token = 'Arplk9SC/C/tdA9aCB414lnwRqvxk3gZFSpH9/vT1uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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