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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bd457ee0f74c31a64882b89c05300df5b8e078a3bd9f80e434246ad2043d5b' 
  AND token = 'MeqXc/ZE2ityhlctPKbwJmdrhfOotUUJG6znodDI+XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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