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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e4d6074d73e8e890c39fea828710a87f477189a7a0d796f61f145325a47b49' 
  AND token = 'TyKWEWy2P36k7KW10jF9S7/IKJhOlYFjfn2klR44+II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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