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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec48470c55cc2a2e82385d80fd63d41c699631023585099effd69cdbb269988' 
  AND token = 'uT9Irx3tlfQ7zTrIKv6goejUneKArC9f449f0x6IU+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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