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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07888751c10d7204048c310007e2b565ca42206ffe2f56570890d90ce93c0b6b' 
  AND token = 'sp+KVCZ2R0Ge0MFebBHXVpjtXiYeO9kZuSU8RPAL1cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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